Why are people talking about the black death?
Same reason people post threads saying Wabbajack, Wabbajack, or whatever.

It's something to talk about.
This particular argument started by talking about KQ enemies, went on to cats, talked about how KQ is biased against cats, which somehow lead to talking about rats, so when someone pointed out that rats spread plague somebody else said the plague spread other ways and then I said its impossible to know for sure which cause of the spread how much plague, so we can't how much rats are at fault, and then the thread got moved here because it no longer had anything do with KQ enemies. Which is probably way more that you wanted to know.

If I recall correctly it started in China and is believed to have spread via fleas on shipboard rats to Europe.
It also didnt help that soon after(?) the witch hunts were started and a lot of cats were killed, not to mention the people.

Sorry, but IIRC the witch hunts took place after the black death by a couple of hundred years for the most part. The Black Death lasted from 1347 to sometime in the 1400's in pandemic proportions IIRC. The witch hunts happened 1450-1700 roughly. It is true that the Black Death provoked pogroms against the Jews though.
Where the Black Death started exactly is something I have heard endless opinions on, and I will not presume to give judgment. It could have been anywhere from Russia to China it seems. I like the sociology and poly sci parts of history, and while I can do as well as the next in arguing the social changes the Black Death brought, when talking about where germs came from and how they spread I'm out of my depth, I was never any good at biology.
If you have an opinion though, certainly feel free to argue it or back it up.
I did a project on the Bubonic Plague back in Grade 10 or 11. I believe it started in Europe and was transmitted to humans from rats. I can't remember how many deaths resulted, but I remember when the first Flu pandemic happened, it killed quite a lot more. 
Quite true about the Flu, though since more people were around to kill in the Early 20thc it is perhaps not suprising. And yes, 95% of textbooks and historians would says it was spread mostly by rats. But since all we really have are some descriptions of the plague, there is always some uncertainty, and thus some argument, if only among professors who need to publish something that sounds important.

I don't know enough to take sides, so I'll leave well enough alone.
